EP0404333A2 - Matériaux macromoléculaires à friction basse pour recouvrir un disque et des surfaces de tête - Google Patents

Matériaux macromoléculaires à friction basse pour recouvrir un disque et des surfaces de tête Download PDF

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Publication number
EP0404333A2
EP0404333A2 EP90305228A EP90305228A EP0404333A2 EP 0404333 A2 EP0404333 A2 EP 0404333A2 EP 90305228 A EP90305228 A EP 90305228A EP 90305228 A EP90305228 A EP 90305228A EP 0404333 A2 EP0404333 A2 EP 0404333A2
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EP
European Patent Office
Prior art keywords
substrate
film coating
film
molecules
acid molecules
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP90305228A
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German (de)
English (en)
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EP0404333A3 (fr
Inventor
Paul Herman Schmidt
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Digital Equipment Corp
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Digital Equipment Corp
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Filing date
Publication date
Application filed by Digital Equipment Corp filed Critical Digital Equipment Corp
Publication of EP0404333A2 publication Critical patent/EP0404333A2/fr
Publication of EP0404333A3 publication Critical patent/EP0404333A3/fr
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D1/00—Processes for applying liquids or other fluent materials
    • B05D1/18—Processes for applying liquids or other fluent materials performed by dipping
    • B05D1/20—Processes for applying liquids or other fluent materials performed by dipping substances to be applied floating on a fluid
    • B05D1/202—Langmuir Blodgett films (LB films)
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B82—NANOTECHNOLOGY
    • B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
    • B82Y30/00—Nanotechnology for materials or surface science, e.g. nanocomposites
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B82—NANOTECHNOLOGY
    • B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
    • B82Y40/00—Manufacture or treatment of nanostructures
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B11/00—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor
    • G11B11/10—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field
    • G11B11/105—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field using a beam of light or a magnetic field for recording by change of magnetisation and a beam of light for reproducing, i.e. magneto-optical, e.g. light-induced thermomagnetic recording, spin magnetisation recording, Kerr or Faraday effect reproducing
    • G11B11/10582—Record carriers characterised by the selection of the material or by the structure or form
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G11B5/10—Structure or manufacture of housings or shields for heads
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G11B5/62—Record carriers characterised by the selection of the material
    • G11B5/72—Protective coatings, e.g. anti-static or antifriction
    • G11B5/725—Protective coatings, e.g. anti-static or antifriction containing a lubricant, e.g. organic compounds
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G11B5/74—Record carriers characterised by the form, e.g. sheet shaped to wrap around a drum
    • G11B5/82—Disk carriers
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S428/00—Stock material or miscellaneous articles
    • Y10S428/90—Magnetic feature
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/26—Web or sheet containing structurally defined element or component, the element or component having a specified physical dimension
    • Y10T428/263—Coating layer not in excess of 5 mils thick or equivalent
    • Y10T428/264—Up to 3 mils
    • Y10T428/265—1 mil or less

Definitions

  • This invention relates to surface coatings for reducing friction between contacting surfaces and for protecting surfaces from corrosion.
  • recording media such as oxide disks were coated with a 30-120A layer of fluorinated oil to reduce friction while the head is in contact with the disk, and to protect the disk from corrosive atmospheric contaminants.
  • This coating has worked well for systems achieving densities of around less than or about equal to 60-100 mB per square inch, wherein the read/write heads fly relatively high over the recording medium, but will no longer be usable with the lower flying heights currently under development.
  • a low-friction corrosion-resistant coated substrate includes a substrate and a macromolecular Langmuir-Blodgett (L.B.) film in coating relationship with the substrate, each macromolecule having a hydrophobic end group and a hydrophilic end group, wherein the hydrophilic end of each macromolecule is bonded to a surface of the substrate or an adhesion layer, and the hydrophobic end of each macromolecule resides at the interface of the film coating and the surrounding air.
  • the substrate may be a magnetic disk or a thermo-magneto optical disk.
  • the L.B. film coating may be less than or equal to about 30 ⁇ or 75 ⁇ .
  • the macromolecules are cross-­linked and/or polymerized and the film coating has a plurality of monolayers substantially of fatty acid molecules.
  • the fatty acid molecules can be stearic acid molecules.
  • the L.B. film coating can include a plurality of monolayers with anti-friction properties essentially the same as a monolayer of polytetrafluoroethylene; each of the monolayers may include stearic acid molecules, each with its methyl group replaced by a CF x group, wherein x may take the value 1, 2, or 3.
  • a low-­friction, corrosion resistant coated substrate includes a substrate and a coating film including planar heterocyclic molecules.
  • the molecules may be planar metal phthalocyanines.
  • a method for making a low-friction corrosion-resistant coated substrate includes applying a Langmuir-Blodgett (L.B.) film coating to the surface of a substrate, wherein the L.B. film coating includes macromolecules, each comprising a hydrophobic end and a hydrophilic end, wherein the hydrophilic end of each macromolecule is bonded to a surface of the substrate or to an adhesion layer and the hydrophobic end of each macromclecule resides at the interface of the film coating and the surrounding air.
  • the L.B. film coating can be less than or equal to about 30 ⁇ or 75 ⁇ .
  • the L.B. film coating can include a plurality of monolayers with anti-friction properties essentially the same as those of a monolayer essentially of polytetrafluorethylene.
  • Each of the monolayers can be a monolayer which includes molecules whose terminal methyl group is replaced by a CF x group, wherein x may take the value 1, 2, or 3.
  • the film coating can be a plurality of monolayers including fatty acid molecules.
  • the fatty acid molecules can be stearic acid molecules or polyacetylenes.
  • a method for making a low-friction corrosion-resistant coating on a substrate including applying a film including planar or nearly planar heterocyclic molecules to the surface of a substrate.
  • the molecules can be planar metal phthalocyanines.
  • a method for the reduction of friction between a read/write head and the surface of a rotating disk recording medium includes the application of a Langmuir-Blodgett (L.B.) film coating to the surface of a recording substrate, wherein the L.B. film coating includes macromolecules, each including a hydrophobic end and a hydrophilic end, wherein the hydrophilic end of each macromolecule is bonded to a surface of the recording substrate or to an adhesion layer of uniform or nearly uniform energy upon the substrate, and the hydrophobic end of each macromolecule resides at the interface of the film coating and the surrounding air.
  • the L.B. film coating can be less than or equal to about 30 ⁇ or 75 ⁇ .
  • the film coating can include a plurality of monolayers essentially of fatty acid molecules.
  • the fatty acid molecules can be stearic acid molecules.
  • the L.B. film coating can have a plurality of monolayers with anti-friction properties substantially the same as those of a monolayer essentially of polytetrafluroethylene.
  • Each of the monolayers can be a monolayer including stearic acid molecules whose terminal methyl group is replaced by a CF x group, wherein x may take the value 1, 2, or 3.
  • a method for the reduction of friction induced between a read/write head and the surface of a rotating disk recording medium includes the application of a film including planar heterocyclic molecules.
  • a method for the exclusion of moisture from the surface of a disk recording medium includes the application of a L.B. film coating of a multiplicity of macromolecules, each having a hydrophobic end and a hydrophilic end, wherein the hydrophilic end of each macromolecule is bonded to a surface of a recording substrate and the hydrophobic end of each macromolecule resides at the interface of the film coating and the surrounding air.
  • the hydrophobic end-group can be an aromatic group.
  • the hydrophobic end-group can be a CF x group, wherein x may take the value 1, 2, or 3.
  • a low-­friction, corrosion-resistant read/write head includes a read/write head; and a macromolecular Langmuir-­Blodgett (L.B.) film in coating relationship with the read/write head, the film including a multiplicity of macromolecules, each having a hydrophobic end and a hydrophilic end, wherein the hydrophilic end of each macromolecule is bonded to a surface of the read/write head and the hydrophobic end of each macromolecule resides at the interface of the film coating and the surrounding air.
  • the L.B. film coating can be less than or equal to about 30 ⁇ or 75 ⁇ , the film coating at least being over a portion of the head air bearing surface.
  • the macromolecules can be cross-linked in a post-polymerization step to improve the thermal stabilization of the L.B. film.
  • the film coating can include a plurality of monolayers which includes fatty acid molecules or polyacetylene molecules.
  • the fatty acid molecules can be stearic acid molecules.
  • the L.B. film coating can include a plurality of monolayers with anti-friction properties essentially the same as a monolayer essentially of polytetrafluoroethylene.
  • the monolayers can include stearic acid molecules, each with its methyl group replaced by a CF x group, wherein x may take the value 1, 2, or 3.
  • a low-­friction, corrosion-resistant, read/write head including a read/write head and a coating of a film having planar heterocyclic molecules.
  • the molecules can be planar metal phthalocyanines.
  • a method for making a low-friction corrosion-resistant read/write head includes applying a Langmuir-Blodgett (L.B.) film coating to the surface of a read/write head, wherein the L.B. film coating has macromolecules, each having a hydrophobic end and a hydrophilic end, wherein the hydrophilic end of each macromolecule is bonded to a surface of the read/write head and the hydrophobic end of each macromolecule resides at the interface of the film coating and the surrounding air.
  • the L.B. film coating is not thicker than 30 ⁇ , or 75 ⁇ .
  • a further step may include subsequently cross-linking the macromolecules to improve the thermal stability properties of the L.B. film.
  • the L.B. The L.B.
  • film coating may include a plurality of monolayers with anti-friction properties essentially the same as those of a monolayer essentially of polytetrafluoroethylene.
  • Each of the monolayers can be a monolayer including molecules whose terminal methyl group is replaced by a CF x , group wherein x may take the value 1, 2, or 3.
  • the film coating can include a plurality of monolayers which includes fatty acid molecules.
  • the fatty acid molecules can be stearic acid molecules or polyacetylenes.
  • a method for making a low-friction read/write head includes applying a film including planar heterocyclic molecules to the surface of a read/write head.
  • the molecules can be planar metal phthalocyanines.
  • the molecules can be planar metal phthalocyanines used in conjunction with a perfluorinated polyether.
  • the molecules can be planar metal phthalocyanines used in conjunction with a perfluorinated polyether.
  • the invention allows lower read/write head flying heights, while also reducing the coefficient of friction, and/or providing a barrier to moisture, and resistant to corrosion due to atmospheric contamination.
  • L.B. films may be in conjunction with use of liquid lubricants for lubrication of the head/disk interface.
  • Langmuir-Blodgett (L.B.) films 12 of the present invention include one or more molecular monolayers, each of which has macromolecules 16 oriented perpendicular or highly inclined to the plane of the monolayers.
  • One end of each molecule 16 is hydrophobic 18, and the other end is hydrophilic 14.
  • Fig. 2 shows that the hydrophobic ends 18 form an interface with the air 11, serving to repel moisture, while the hydrophilic ends 14 are bonded to the hydrophilic substrate 10.
  • L.B. films are made one or nearly one layer at a time.
  • the organic molecules 16 which comprise each monolayer 12 have a unique and precisely known molecular length. Thus, by depositing a known number of layers, the thickness of the film can be controlled to within a few angstroms.
  • Molecular engineering of the molecular end groups 18 can enhance the frictional lubrication and wear properties of the coating.
  • Aromatic end groups 18, for example, would enhance the hydrophobic, or water repelling properties of the coating.
  • the addition of aromatic side groups 20 may be used to increase the thermal stability of the coating.
  • a solvent container which has a fixed end 22, and an opposing movable piston 24.
  • Coating material such as stearic acid
  • the solvent 23 which is chosen on the basis of the desired orientation of the hydrophobic/hydrophilic ends with respect to the surface to be coated.
  • Minimum energy requirements automatically force the molecules 16 into a monolayer.
  • Fig. 3b using the movable piston 24, pressure is exerted along the surface of the solvent 23 so as to force the molecules 16 together. Intermolecular van der Waals attractions cause the monolayer to become semi-crystalline. The monolayer will remain semi-crystalline as long as the pressure is maintained.
  • the substrate 10 to be coated is then dipped into the solution 23.
  • the monolayer may be allowed to remain in the semi-­crystalline state after being applied to the surface to be coated with one end of each of the molecules affixed to the surface.
  • the film may be further engineered through exposure to bond breaking ionizing radiation for modification of film properties. This will result in a material which is darker (i.e., more reflective), harder, and more resistant to thermal destruction, such as would be desirable in high contact uses.
  • the substrate 10 is again dipped into the solution 23, while maintaining pressure with the piston 22 to deposit a second layer 26. Pulling the substrate out of the solution 23 will deposit a third layer 28. Pre-treating the surface of the article to be coated 10 determines whether the hydrophobic 18 or hydrophilic 14 end of the molecules will reside at the air interface 11.
  • the film is preferably less than or equal to 75 ⁇ thick, with the hydrophobic ends of the molecules residing at the air interface 11.
  • a suitable molecule for this application is stearic acid CH3(CH2)16COOH.
  • the hydrophobic end (CH3) resides at the air interface 11 so that moisture is excluded from the coated surface 10.
  • Modification of the stearic acid molecule includes where the methyl (CH3) group 30 is replaced by a (CF3) group 32.
  • the (CF3) groups form a surface with properties similar to a monolayer of polytetrafluoroethylene.
  • the (CF3) groups may be replaced with CF or CF2 groups yielding similar results.
  • replacing the hydrophobic (CH3) group 18 with an aromatic group will produce a surface with still different properties, such as a more thermally stable surface.
  • the aromatic groups 20 may be affixed along the main carbon chain 34 so as to increase the thermal stability. This is advantageous when contacting heads and disks at high rotational speeds.
  • the film 12 is polymerized after being applied to the substrate 10.
  • the molecules are encouraged to form intermolecular cross-links 19 such as shown in Fig. 2.
  • planar heterocyclic molecules such as the planar metal phthalocyanines, may also function as a corrosion-resistant, moisture-­repellant and friction-reducing coating.
  • Phthalocyanines are soluble in known solvents, and therefore can be deposited by a method similar to the L.B. technique, simply by dipping the substrate 10 in a solution of planar metal phthalocyanine molecules.
  • Films of planar heterocyclics differ from the L.B. films in the way they protect the surface of the medium in that the constituent molecules are oriented coplanar among themselves and nearly coplanar with the surface of the substrate 10, multiple layers thus forming a graphite-like assembly. These layers are capable of slipping with respect to each other, similar to the sliding behavior of the stacking planes of graphite.
  • a low-friction corrosion-resistant film in practice of the present invention, may be applied to various surfaces, such as moving, flying or sliding in a recording system, with improved, frictional, thermal and/or wear properties.
  • the film may be applied in various thicknesses, having a multiplicity of molecules, in the manner taught herein.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Nanotechnology (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • General Physics & Mathematics (AREA)
  • Physics & Mathematics (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • Composite Materials (AREA)
  • Materials Engineering (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Magnetic Record Carriers (AREA)
  • Laminated Bodies (AREA)
  • Lubricants (AREA)
EP19900305228 1989-06-22 1990-05-15 Matériaux macromoléculaires à friction basse pour recouvrir un disque et des surfaces de tête Withdrawn EP0404333A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US369713 1989-06-22
US07/369,713 US5120603A (en) 1989-06-22 1989-06-22 Magneto-optic recording medium with oriented langmuir-blodgett protective layer

Publications (2)

Publication Number Publication Date
EP0404333A2 true EP0404333A2 (fr) 1990-12-27
EP0404333A3 EP0404333A3 (fr) 1991-02-27

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EP19900305228 Withdrawn EP0404333A3 (fr) 1989-06-22 1990-05-15 Matériaux macromoléculaires à friction basse pour recouvrir un disque et des surfaces de tête

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US (1) US5120603A (fr)
EP (1) EP0404333A3 (fr)
JP (1) JPH0340218A (fr)
CA (1) CA2016341C (fr)

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EP0514703A2 (fr) * 1991-04-30 1992-11-25 Sony Corporation Anneau de support avec friction glissante réduite pour un disque optique
WO1994021386A2 (fr) * 1993-03-25 1994-09-29 Research Corporation Technologies, Inc. Polymeres utiles pour la formation de couches ultra-minces anisotropes collees auto-assemblees et leur utilisation
WO1997044780A1 (fr) * 1996-05-20 1997-11-27 International Business Machines Corporation Support d'enregistrement en alliage a memoire de forme, memoires basees sur ledit support, et procede permettant d'utiliser lesdites memoires

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US6243350B1 (en) 1996-05-01 2001-06-05 Terastor Corporation Optical storage systems with flying optical heads for near-field recording and reading
US5936928A (en) * 1996-10-01 1999-08-10 Terastor Corporation Multilayer media and use with flying head having solid immersion lens
US6270696B1 (en) 1996-06-03 2001-08-07 Terastor Corporation Method of fabricating and integrating an optical assembly into a flying head
ID16848A (id) * 1996-05-01 1997-11-13 Terastor Corp Kepala layang dengan lensa padat yang terbenam
US5793584A (en) * 1996-12-13 1998-08-11 Terastor Corporation Device and method for electrostatically cleaning a disk mounted in a removable cartridge
US5828482A (en) * 1997-02-05 1998-10-27 Terastor Corporation Apparatus and method for directing a beam of light to a surface of an optical disk
US5963532A (en) * 1998-01-21 1999-10-05 Terastor Corporation Polarization rotation and phase compensation in near-field electro-optical system
US6009064A (en) * 1997-11-05 1999-12-28 Terastor Corporation Optical head having dielectric transition layer in near-field optical storage system
BR0008208A (pt) 1999-02-12 2002-02-19 Gen Electric Meios de armazenamento de dados
WO2001001403A1 (fr) * 1999-06-24 2001-01-04 Fujitsu Limited Procede de production d'un support d'enregistrement magnetique et support d'enregistrement magnetique ainsi obtenu
KR20030076465A (ko) * 2003-05-21 2003-09-26 성진현 컴퓨터용 마우스

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Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0514703A2 (fr) * 1991-04-30 1992-11-25 Sony Corporation Anneau de support avec friction glissante réduite pour un disque optique
EP0514703A3 (en) * 1991-04-30 1994-08-10 Sony Corp A bearing ring with low sliding friction for an optical disk
US5447768A (en) * 1991-04-30 1995-09-05 Sony Corporation Optical disk with a bearing ring
WO1994021386A2 (fr) * 1993-03-25 1994-09-29 Research Corporation Technologies, Inc. Polymeres utiles pour la formation de couches ultra-minces anisotropes collees auto-assemblees et leur utilisation
WO1994021386A3 (fr) * 1993-03-25 1995-01-26 Res Corp Technologies Inc Polymeres utiles pour la formation de couches ultra-minces anisotropes collees auto-assemblees et leur utilisation
US5686548A (en) * 1993-03-25 1997-11-11 Research Corporation Technologies, Inc. Polymers useful in forming self-assembled bonded anisotropic ultrathin layers and their use
US5686549A (en) * 1993-03-25 1997-11-11 Research Corporation Technologies, Inc. Polymers useful in forming self-assembled bonded anisotropic ultrathin layers and their use
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CA2016341A1 (fr) 1990-12-22
JPH0340218A (ja) 1991-02-21
CA2016341C (fr) 1994-03-29
US5120603A (en) 1992-06-09
EP0404333A3 (fr) 1991-02-27

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